Karl wilke



Patented Feb. 3, 1931 UNETE s Ares KARL WILKE, OF HOCI-IST-ON-THE-MAEN, GERMANY, ASSIGNOR TO GENERAL ANILINE WORKS, INC., 6F NEVT YORK, N. 1., A CORPORATEON OF DELAWARE.

VAT DYESTUEFS OF THE BENZANTHRONE PYRAZOLEANTHRONE SERIES AND PROCESS OF PREPARING THEM N Drawing. Application filed. August 29, 1927, Serial No. 216,338, and in Germany August 30, 1926.

My presentinvention relates to vat dyestufis of the benzanthrone-pyrazoleanthrone series and process of preparing them.

I have found that new valuable vat dyestuffs of the benzanthrone-pyrazoleanthrone series are obtained by treating with an alka line condensing agent an N-benzanthronyL pyrazoleanthrone, obtainable for instance from a pyrazoleanthrone and a Bz-l-halogen in benzanthrone. These dyestuffs have probably a structure similar to that of the dibenzanthrone, so that the reaction may be illustrated by the following formula my invention, but they are not intended to limit it thereto the parts are parts by weight l. 22 parts of pyrazoleanthrone and 31 parts of Bz-l-bromobenzanthrone are stirred for 7 hours at boiling temperature in the presence of 15 parts of potassium carbonate and about 0.5 part of copper carbonate in 300 parts of nitrobenzene. The benzanthronylpyrazoleanthrone which separates on cooling hol and heated in the steam bath for 5 to 6 hours at about 90 C. to 100 C. The mass is then dissolved'in water, the dissolved leucocompound is oxidized by passing air through the solution and the dyestufi which has separated is filtered and washed. It forms a blackish-blue paste, and in a dry state is a violetblue powder of a metallic lustre. It is soluble in concentrated sulfuric acid to a dull violetred solution which changes to green when the solution is carefully diluted with water. On further adding water to the solution blue flakes are separated. The dyestuff gives with alkaline hydrosulfite a greenishblue vat dyeing cotton fast blue tints. V

2. If alkali is caused to act upon benzanthronylpyrazoleanthrone at a higher temperature, another dyestufi' is formed, obviously by the way of the product described in Example 1. o

Into a melt, heated to 160 0., of 150 parts of caustic potash and 7 5 parts of alcohol are introduced in an atmosphere of nitrogen 10 parts of benzanthronyl-pyrazoleanthrone, and the whole is stirred at 160 C. for 3 hours. The mixture is then poured into water, and the dyestuff is entirely separated in the form of greenish grey-blue flakes by passing air through the solution. After filtering and washing a black paste is obtained which forms when dried a brownish-black powder. It dissolves in concentrated sulfuric acid to an olive-brown solution which changes to green on addition of a small quantity of water and from which on stronger dilution green flakes are separated. The dyestufi yields with alkaing to Example 1.

The BZ-2 phenylbenzanthronylpyrazoleanthrone used as starting material can easily be prepared by condensing pyrazoleanthrone with Bz-l-chloro-Bz-2-phenylbenzanthrone of melting point 248 C. It is a yellow crystalline powder melting at 321 C. and dissol *ing in concentrated sulfuric acic to a red solution with an intense yellow line and without fluorescence.

' 4. By condensing 4-methylpyrazcleanthrone (of. Berichte der Deutschen Chemischen Gesellschaft, vol. L 2162) with Bz-l-bromobenzanthrone an l l-Bz l-benzanthronyl-l-methylpyrazolenanthrone is obtained whichwhen recrystallized from nitrobenzene forms a brownish-yellow powder melting at 832 C. to 353 C.

By condensing this product in alcoholic potash at the tem erature of the steam bath as indicated in Example 1, a dyestuii is pro- 7 duoed which in the "form of its'paste is bluishbrownisltyellow solution.

hydrosulfite a blue vat with a greyish-blue green, and in dry state is black. greenish-blue .vat with a bluish-green separation on its surface My access ot'aii and dyes cotton beautiful greenish-blue tints.

5. The nitrobenzanthroiiylpyraz'oleanthrone prepared from nitrated Bz-l-bromobenzanthrone of melting point 292 C. (of;

the co-pending U. S. application (der. llo. 117,568 filed June 21, 1926) and pyrazoleanthrone, is a'reddish-yellow powder which after a single recrystallization from a large quantity of nitrobenzene melts at 404 C. to

405 C. By reducing this nitro-body with stannous chloride in a mixture of glacial acetic acid and hydrochloric acid, red amino-benzanthronylpyrazoleanthrone is obtained melting at 417 C.

Both this nitro-and the amino-benzanthronylpyrazoleanthrone yield when melted wi h alcoholi potash as indicated in Example 1, a dyestui'l which constituuesa darl: green The d estuii dis paste or a black owder. solves in concentrated sulfuric acid to a It gives with separation on surface by access of air which dyes cotton'a greyish-green tint whic' becomes more intense on ch orination.

6. condensing one mol cular proportion of dipyrazoleanthrone (of. Berichte der Deutsclien Qhemischc-n n cvesellschaft. vol. 45, page 2246) and 2 molecular proportions of The dyestutl is worked up as usual It gives a B9;-l-broinobenzanthrone in nitrobenzene in the presence of potassium carbonate and a copper salt, an Isl-ll-dibenzanthronyh dipyrazoleanthrone can easily b m2 This hot y can be rec ystalli from a very large quantity of nitrohenzenc; it then forms a powder of orange-yellow crystals which do not melt even at 450 C. it dissolves in concentrated sulfuric acid to a reddish-yellow solution.

20 parts of the above-named dihenzanthronyldipyrazoleanthrone are introduced into a melt, heated to about 150 G. to 160 0., Jrepared from 100 parts ofcaustic potash 100 parts of alcohol, and the mixture is stirred at tl is temperature for three hours. and is then. obtained in the form of a'brownishviolet paste and when dried is a dark brown powder dissolving in concentrated sulfuric acid to an olive-green solution. The dyestui i forms in a violet-red alkaline hy cosullite'vat a red lenco-compound which. dissolves rather sparincly. It gives on cott i violet-red dye- 7. To a suspension oi 10 parts of the final product of henzanthronepyrazol anthrone (cf. Example 1) in 100 parts of dry nitrobensene are added at ordinary temperature 10 parts of sulturyhchloride, and the mixture lo heated on the water bath to about C. for about 3 hours. After the evolution of very strongly, cooled diluted washed with l vl i net dissolves in a quantity of boi g nitrobenzene'to a violet-blue solution irom which the chlorinated dyestufi crystallizes in the form of reddish-violet crystals. It forms dry a dark bluish-violet powder dissolving in sulfuric acid. of 66 lie. to a greyish-violet solution.

[hydrochloric aci was, which at first sets in filtered and ater. The prod- On careful addi-.

tion of a small quantity of water the color or this solution changes to green, and one stronger dilution bright reddish-violet flakes separate. The dyestuff gives with hydrosulfite a greenish-blue vat from which cotton is dyed intense violet-blue shades of excellent properties of fastness. According to the results of analysis it is most probably a dichlorobenzanthronepyrazoleanthrone.

8. Through a suspension of 10 parts of the final product of benzanthronepyrazoleanthrone in 100' parts of nitrobenzene is passed a feeble current of dry chlorine at a temperature of the external bath of 7 0 C. to 80 C. 'After about t hours the product is worked up as indicated in Example 7 its properties are very similar to those of the product obtainable according to Example 7.

9. Into a solution of the final product of 10 parts of benzanthronepyrazoleanthrone in 100 parts of chlorosulfonic acid to which about 0.05 to 0.10 parts of finely powdered iodine has been added, is introduced a feeble current of chlorine at temperature of the external bath of about 60C. After about 3 hours the mixture is poured into ice-water, the dyestufi' which is precipitated is filtered, washed and,if necessary, dried. It crystallizes from a large quantity of boiling nitrobenzene in the form of violet crystals. The pure dyestufi is soluble in sulfuric acid of 66 B. to a yellowish-olive solution which on addition of some water changes to green. 011 more highly diluting the solution reddish-violet fialres are precipitated. The dyestufi gives with hydrosulfite a greenish blue vat which dyes cotton a reddish-blue tint. A sparingly soluble leuco-compound easily separates from the vat, which indicates the presence of a highly-chlorinated product. Probably it is a tetrachlorobenzanthronepyrazoleanthrone.

10. 10 parts of the final product of benzanthronepyrazoleanthrone are boiled in a reflux apparatus in 100 parts of glacial acetic acid with 40 parts of bromine until the evolution of hydrogen bromide is finished. After cooling, the mass is filtered, washed and, if necessary, dried. The brominated dyestuff crystallizes from a large quantity of boiling nitrobenzene in the form of bluish-violet crystals. It is soluble in sulfuric acid of 66 B. to a greyish-violet solution which, on dilution, first changes to green, and then violet blue flakes are precipitated. The dyestuf'f gives a greenish-blue vat which dyes cotton greenish-blue tints. As the analysis shows, the body is a dibr-omobenzanthronepyrazoleanthrone.

11. A brominated dyestuff which is very similar to that obtained as described in the preceding example is obtained by heating benzanthronepyrazoleanthrone in 10 times its weight of nitrobenzene with the quantity of bromine calculated for the entrance of two molecular proportions, for several hours on the water-bath. The dyestufi, when worked up as usual and recrystallized from a large quantity of nitrobenzene, dissolvesin sulfuric acid of 66 B. to a reddish-violet solution. dyes cotton a greenish-blue shade.

I claim:

L The process of preparing vat dyestuffs of the benzanthronepyrazoleanthrone series comprising the steps of treating with an alkaline condensing agent an N-benzanthronylpyrazoleanthrone of the following formula:

wherein X stands for hydrogen or any substituent, R for hydrogen or any substituent and R for oxygen'or B l-B; for the residue in. 1Lzl-benzanthrany],'

and causing an oxidizing agent to act upon the product so obtained.

2. The process of preparing vat dye'stufis of the benzanthronepyrazoleanthrone series comprising the steps of treating with an alkaline condensing agent at temperatures of about 90 C. to 160 C. an N-benzanthronyl-- pyrazoleanthrone of the following formula:

NN- tu wherein X stands for hydrogen or any sub stituent,R for hydrogen or any substituent and R for oxygen or li t-R for the residue I l Mt ILzI-benzanthronyl,

and causing an oxidizing agent to actupon the product so obtained.

It gives a greenish-blue Vat which s of treating with a mix- 11 and alcohol at temperasubstituent 1 for the resldue 7 hronyl,

Vat dyestufi's throne serles L g the step ture of caustic potas ures of about 90 C. to 160 C. an N-bene zanthronyl-pyrazoleanthrone of the follow- 1- oxygen or 11 Bzl-benzant The process of preparing s of the benzanthrone-pyrazolean and causing air to act upon the product so and causing an oxidizlng agent to act upon bflilm the product so obtalned. 6.

coinnrisin 1: g formula:

wherein X'stands for hydrogen or any substituent, R for hydrogen or any and R f0 and R for oxygen or R +R for the residue g Vat dyestuis n'one-pyrazoleanthrone setreating with an denslng agent at a temperatu of 90 G. to 100 C. an N-benzanthronylyrazoleanthrone of the following formula:

any substituent .1. ii i gen OZ l ries con1prisin the steps 0 Bzl-benzanthronyl,

ss of preparing vat dyestu 3. The process of preparin of the benzant alkaline con V wherein X stands for hydrogen or any substltuent, R for-hydro 4.: The proce 0 0 e w 1 l 1 1 View wai mtmw aam m b1 h O X t N I \6 5// v XO QU A oe m 8 m Ha .i g. 4 m 9 d 1 2 r nwm X M v X2 1A \2 3/ S i V 1 A pm M yv 00m P, A 2 sp k NH\9 000 Z y t m u 1 N w w A .MCQJAM 7 6 110T. 1 X rou u D n 16 01 CUP ULL a e n6 l1 S H E nwm o m HMC X X fl. mme 6 5 O H n X 7 awl U NTMH 1 X oe wn X 4/ at n 9 X m hmm 1 2 SS z W d B X Q \2 3/ etoa X nspm N1 1 4 X .mmv mi nn h S11 m ngu r N 9 l ana m 1C F er LL 8 5 bP g 7 6 m X X 6 12 1d CHEW. ru beo when f. onmNnm m m w m for hydrogen or any substit lent and R for oxygen or By!- R for the residue Wherem X Stands for y n or 31 stituent, R for hydrogen or any substnuent 1] and R for oxygen or R +R for the residue NN I Bzl-bgnzanthronyl, '1 7125.5

r Bzl-benzanthronyl,

ing vatdyestuffs and causing air to act upon the product so of the benzanthrone-pyrazoleanthrone series obtalned.

wherein X stands for hydrogen or any subrr' st1tuent,R

and causing air to act upon the product so obtained,

5. The process of prepai 7. The process of preparing vat dyestuffs of the benzanthrone-pyrazoleanthrone series'by treating N-benzanthronyl-pyrazoleanthrone with an alkaline condensing agent and causing an oxidizing agent to act upon the product v 10. The process of preparing a vat dyestufi' of the benzanthrone-pyrazoleanthrone seriesby treating N-benZanthronyl-pyrazoleanthrone with a mixture of caustic potash an alcohol and causing air to act upon the product so obtained.

11. The process of preparing a vat dyestuft of the benzanthrone-pyrazoleanthrone series by treating N-benzanthronyl-pyrazoleanthrone at temperatures of about 90 C. to 160 C. with a mixture of caustic potash and alcohol and causing air to act not so obtained.

12. The process of preparinga vat dyestufl of the benzanthrone-pyrazoleanthrone series by treating N-benzanthronyl-pyrazoleanthrone at a temperature of 90 C. to 100 C. with a'mixture of caustic potash and alcohol and causing air to act upon the product so obtained.

13. As a new product, the vat dyestufi of the following formula being soluble in concentrated sulfuric acid to a violet-red solution WhlCh on additlon of water changes first'to green and then sepa:

rates blue flakes and yielding with hydrosulfite a greenish-blue vat from which cotton is dyed fast blue tints.

14. As new products, vat

dyestuffs of the upon the prodshades.

benzanthrone-pyrazoleanthrone series of the following formula:

wherein X stands for hydrogen orany sub stituent, Y stands for hydrogen or any substituent, R and R stand forhydrogen' or any substituent, R stands for oxygen or R R and R together stand for the residue wherein X stands for the same substituent,

represented by X, the said dyestuffs dyeing cotton from the'vat inmost cases bluish 15.. As new productsyvat dyestuffs of the benzanthrone-pyrazoleant following formula:

wherein X stands for hydrogenor halogen,

Y stands for hydrogen or halogen, R 'and R5 stand for hydrogen or halogemB; stands for hi'one series of the d Shadesstand for hydrogen or chlorine and theothers 'wherein X stands for the same substituent, represented by X, the SitlCtdYGStufiS dyeing 17. As new oxygen or R R and R together stand for benzanthrone pyrazo1eanthrone series of the the residue following formula:

wherein X stands for the same substituent, represented by X, the sand dyestuffs dyelng 4 4. .2; a ,L J 1 1- cotton 110111 the vat 1n B1054; cases bhnsh Wiley an two of types X Y, R1 and R2 new P} l v yi dYOStLFLS i send for hydrogen, B stands for oxygen or v M, 1 q I enzan Tone P57151710 e 4 Che m 0 t 16 n R and R together stand Eor the reslduez following formula wherein X stands forjthesam'e substitnent, represented by X; the said dyestuffs dyeing cotton from the vat in most cases bluish sha'des.- 7}

18. As new products, vat dyestuffs" of the enzenthrone-pyrazo1anthrone series of the "following fornmlaz.

wherein two of the types X, Y, R and R stand for hydrogen or halogen and the oth-' ers stand for hydrogen, R stan'dsfor oxygen or R R and R together stand for the residue 19.- As new products, Vat dyestuffs-of the cotton; from the vat in most cases bluish shades.

products,"vat dyestuffs of the.

following general formula 22. As a new product, the Vat dyestuff'of the following formula: v

7 being soluble in concentrated sulfuric acid to wherein X and X represent hydrogen or a greyish-violet solution which, on careful halogen, the said dyestuffs dyeing cot-ton addition ofasmall quantity of water, changes from the vat bluish shades. to green and on further dilutionseparates.

2G 20. As new products, vat dye tuff of the reddish-violet flakes, and yielding wlth 85 benzanthrone-pyrazolanthr0ne series of the hydrosulfite in alkaline solution a greenlshfollowing formula: blue vat from which cotton is dyed intense violet-blue shades'of good fastness. v

- In testimony whereof, I affix my signature.

KARL WILKE. 90

NN o

wherein X and X represent identical or different substituents of the group consisting of hydrogen, chlorine and bromine, the said dyestuffs dyeing cotton from the vat bluish shades.

21'. As a new product, the Vat dyestufl of the following formu a: 

